| Spoiler warning!|
This article contains plot details from the latest books.
Book 7 was first announced when Lodestar was released. It is currently available for order on Amazon and Barnes & Noble, and its release date was November 6, 2018.
Book 8 and Book 9 of the series have been confirmed as future releases.
Shannon Messenger announced that the title of book 7 would be announced on February 1, 2018. When she released the title, she said that she saw a few people had guessed it. The much awaited seventh book is named Flashback.
There is also a Barnes and Noble exclusive edition of Flashback, featuring illustrated end pages and a bonus chapter in Fitz's perspective, which will answer one of the longest standing questions from the series. It is available for pre-order on the Barnes and Noble‘s official site. Fans (or non-fans) who pre-ordered any version of Flashback (audiobook, ebook, the actual book) could sign up for the Flashback Giveaway to receive a signed bookplate, postcards featuring Iggy (yellow and sparkly as voted by fans) and a picture of Silveny and Greyfell! Fans had until November 6, 2018 to sign up.
Sophie Elizabeth Foster doesn’t know what or who to believe. And in a game with this many players, the worst mistake can be focusing on the wrong threat.
But when the Neverseen prove that Sophie's far more vulnerable than she ever imagined, she realizes it's time to change the rules. Her powerful abilities can only protect her so far. To face down her ruthless enemies, she must learn to fight.
Unfortunately, battle training can’t help a beloved friend who's facing a whole different danger—where the only solution involves one of the biggest risks Sophie and her friends have ever taken. And the distraction might be exactly what the villains have been waiting for.
In this unforgettable seventh book in the New York Times and USA TODAY bestselling Keeper of the Lost Cities series, Sophie must let the past and present blur together, because the deadliest secrets are always the ones that get erased.
The cover was revealed on March 8, 2018 at 12:00 (Pacific Time).
In this scene, Sophie, Tam, and Wylie are at some ruins in a forest where the twin baby alicorns' hive is located, that the trolls are working on. On the cover, Wylie and Tam are working together to produce the illusion of a bridge leading to an endless chasm so that the baby alicorns will be hidden while they further develop. Sophie believes that she hears a noise in the woods and flings her goblin throwing star at it, not knowing it was one of her bodyguards (Tarina.) She is wearing the new training clothes that Flori made for her, with more pockets to accompany weapons and other gadgets that Dex makes. Sophie is left handed due to her right arm still in recovery from Umber attacking her with shadowflux. She has a bracelet on her arm to improve her strength with her left arm. She also has a new Ruewen Crest that will scramble the Neverseens attempts at tracking her with technology.
- "So is it strange coming here and not being the one on trial?" Keefe asked, checking his expertly styled blond hair in a shiny facet on one of the jeweled walls before he followed Sophie into Tribunal Hall. "Because I'd be happy to help you break a few laws if you're feeling left out."
- "I'm tired of being weak," Sophie whispered. "I want to fight back—and I mean really fight."
- Keefe smirked. “Epic Fitzphie fail.”
- I’ve had to keep secrets my whole life, Sophie reminded him. It’s a hard habit to break. (Telepathic conversation.)
- “Looks like things are about to get interesting here in sparkle town.”
- “With the Neverseen...we’re always missing something. There’s always some trick we don’t see until it’s too late.”
- “Embrace the sparkles, Foster,” Keefe told her. “They look good on you.”
- “The battle is coming for me whether I want to fight or not.”
- “Relax, I’m just giving you a hard time. It’s my greatest joy in life.”
- “Anyone else thinks we have too many enemies?” Marella muttered under her breath.
- "The thing is, Sophie told Keefe. It doesn't matter WHY we all became friends. Just that we did."
- Tam whistled. "And to think, when I left Exillium, I thought my life as maybe going to be a little more normal.
- "Oh joy, it's going to be a long night of sulky boy angst. . . Quick, who wants to change jobs with me?"
- "The Neverseen are never going to stop—not until they've destroyed everything and taken over. And people like that... you can't beat them by playing it safe."
Many Vackers gathered to hear the Council decide what to do with Alvar, who had lost his memory. Sophie, Keefe, the Councillors, and bodyguards were the only non-Vackers present. The Council decided that they could not currently sentence Alvar due to his memory loss, and decided he was to spend six months at Everglen carefully observed. Fallon Vacker shows up, and protests Alvar's future residence at Everglen because of the possibility of something secret hidden there. Luzia Vacker, mother of the famous Orem Vacker and founder of Everglen, discards these claims, stating that she only chose Everglen to relax after a long day of bending sunlight. However, Sophie, Keefe and Fitz all think she is hiding something.
- The Training Area and an Encounter With the Neverseen
Sophie finds Fitz at a makeshift training area they had set up in the middle of nowhere. After a while of talking and training with Grizel, members of the Neverseen (Gethen, Umber and Ruy) show up. Umber tortures Sophie, Fitz, and their bodyguards using Shadowflux, which we later learn was to motivate Tam to learn how to control it as well. This causes severe injuries to both Sophie and Fitz. Sophie presses her panic switch, and eventually, Dex, Wylie, and Lovise arrive to save them, getting minor injuries in the process. During this meeting, the Neverseen reveals that the caches Keefe got during his exploit in their base are fake.
- The Recovery and Echos
Sophie and Fitz end up in the healing center at Foxfire, and are stuck there recovering for several weeks. Tam saves them from the shadowflux that Umber used, and decides to learn how to control it in an attempt to even the playing field. Sandor attempts to resign his position as Sophie's bodyguard, but she convinces him to stay by threatening that—with the help of Tam, Dex and Keefe—she would be the worst possible charge to the new guard.
Sophie and Fitz have shadow imprints from their attack by Umber, called echoes. Sophie has one near her head, Fitz near his heart. These lead Sophie to experience terrible nightmares based on her fears and traumas over the years, slowing her recovery, while Fitz has to manage his emotions, or else his breathing becomes constricted and his heart feels like something's crushing it. Recovery time is spent resting from all their injuries, training in Exillium skills with Keefe and learning how to deal with their echoes.
- Sophie's Trackers and Keefe's Memory
Sophie learns that she's had a tracker that the Neverseen were using to track her, given to her by Keefe--the chain of the Black Swan necklace Keefe had handed her when he blew up Foxfire. She and Keefe talk, and Sophie mentions learning how to fight with weapons, not just Talents. Keefe agrees and the others start training. Keefe comes back and asks Fitz and Sophie to look inside his mind to find any memories he might have missed. They search, and find one that was shattered, and not meant to be recovered. In the memory, Lady Gisela is telling Keefe to deliver an envelope to someone in the Forbidden Cities, who she later confesses she was trying to recruit. The address was in London, and the building had a green door. Keefe also mentions a pair of green eyes, which Sophie also saw in one of her nightmares.
- Leaving the Healing Center
After several weeks of recovery, Elwin allows Sophie and Fitz to leave the Healing Center—though not Foxfire. While they wander the halls at night, they find out Tam has been training with Lady Zillah to learn to control Shadowflux every night, with Linh to keep him company. After more recovery, Fitz only is allowed to go home, since his echo was not as severe as Sophie's. At first, he wants to stay until she is released as well, but after Biana comes to visit, Sophie convinces him to go home and be there for his sister when Alvar comes to stay. She stays in contact with him, and learn about the deal he struck with his parents regarding his older brother.
- Sophie's Bodyguards and Training
Once Sophie gets back to Havenfield, Sandor greets her with four new bodyguards: Bo the ogre (who we later learn is married to Ro), Flori the gnome, Nubiti the dwarf and Tarina the troll. After everyone is introduced, Tarina starts a conversation with Sophie in her native tongue, asking for an alliance with the Moonlark on her queen's behalf. Sophie says she'll think about it. Sandor then sets up a training session for her, teaching her how to hold and throw a dagger. He rigs the dummy with lushberry juice as blood to show her the horrors of battle, and Sophie freaks, showing herself how unprepared she was.
- Sophie and Fitz
When Sophie and Fitz both get wounded by Shadowflux, they were stranded together in the Healing Center with Elwin. They grew closer throughout this time and at one point Fitz even hand fed Sophie because she couldn't open the elixirs due to her arm. They even walked around alone through Foxfire one night. Throughout the book, their relationship grows closer, especially when Fitz tells her that she is the only one he wants on his matchmaking list while at Everglen. Sophie then admits her crush. They almost kiss before Silveny invades Sophie's head to tell her the baby is coming. Sophie often leans on Fitz's shoulder throughout the book, saying it is her favorite place. They have moments like this throughout the book. However, they decide not to do the relationship/making it official because Sophie isn't ready. One point, before they meet with Fintan, Fitz comes to Havenfield and gives Sophie a teal heart shaped locket.
- The Celestial Festival and The Hidden Troll Hive
After a visit to Fintan, Fitz and Sophie learn that the Neverseen are planning something for the Celestial Festival. The Black Swan makes a plan to use illusions to capture any Neverseen members: holograms of the keeper crew will be milling around the crowd, while the real crew walks along the perimeter of the festival, searching for members of the Neverseen. They come up with nothing, but Alvar's tracker says he is moving around Everglen. Fitz becomes suspicious and tries to shock him—however, Sophie's fake pin that she got from Tinker disrupts the gadget and it doesn't work. Everyone then leaps to Everglen to stop Alvar.
They find Alvar at the gates, and Fitz tackles him to the ground and beats him. The Neverseen show up, including Cad, Ro's ex-boyfriend, and try and coax Fitz into murdering his older brother; if not for Sophie's words, he might have. But when he fails, the Neverseen disappear, revealing the images in front of the crew were just illusions. Sophie and her friends then follow them into the woods of Everglen, where they watch Alvar turn on the override and they discover the hidden troll hive.
Three of the baby trolls escape. One takes down one of Cad's guards, and the other two go after Sophie and her friends. They eventually defeat the baby trolls using their own teeth against them. In the fight, Umber gets squished by the door of the hive and killed. Her skull is so crushed that it' impossible to determine her identity. Alvar is trapped in one of the birthing pods, but survives and later escapes using temperature regulation and breathing control skills, which Keefe says he excells at.
- Tam's Capture
Soon after the battle of the hive, Silveny transmits to Sophie, saying there's danger and asking for Keefe and Tam. Sophie immediately teleports with Keefe and Tam to where the baby alicorns are being kept, and finds Lady Gisela standing between Silveny and Greyfell. Lady Gisela says they need a Shade, due to Umber's death, and turns her attention to Tam. He asks Lady Gisela, sarcastically, if they plan on kidnapping him. Keefe's mom replies that they learned kidnapping doesn't work, and proceeds to shoot Silveny and Greyfell with a new version of soporidine. She then holds up the antidote and tells Tam the only way to get it and save the alicorns is to join them. When he still hesitates, she threatens then baby alicorns as well, causing an outburst from Keefe. Finally, Lady Gisela tells Tam that she has ways to hurt Linh, saying if he refused, "chaos would rain down on her within the hour." Tam finally agrees, despite Sophie's desperate assurances that they can protect Linh (which weren't very secure, since their last assured safety wasn't very safe) and Keefe's warnings that he's making a big mistake. Tam hands Sophie the antidote, and Lady Gisela warns him that he will not have the same privileges Keefe did, and, until he proves himself, that he's expendable. Before Sophie and Keefe can react, she knocks Tam out and leaps away with him. Sophie is worried and wants to go rescue him.
Linh is the one that says they shouldn't rescue him, saying that her brother could take care of himself.
At the end of the book, Sophie asks her parents to register for the match. Grady immediately goes into protective father mode. However, Edaline is ecstatic and helps Sophie get ready. They go to Atlantis with Sophie dressed in her best gown. When they arrive at the matchmaking building, Sophie takes a deep breath before walking in. Her registry feed alerts them she is there, so she waits in the waiting room as people whisper around her about the fact that Sophie Foster is registering for the match. She is pulled into a room alone with two workers whose movements are the exact same. They ask her some questions, including who her birth parents are. Sophie cannot answer this because she was never told. After a few minutes of awkward and anxious waiting it comes back that Sophie Foster is UNMATCHABLE. It is presumed she is unmatchable because she does not know who her genetic parents are.
- Fitz's POV Short Story
In the B&N Exclusive, Biana pushes her brother to admit he has a crush on Sophie. It is revealed that Biana has a crush on a boy, but we don't know who. When Fitz finally did, Biana caught him with a "dopey smile" on his bed.